{"id":"energy-recovery-ventilator","version":"0.2.0","classification":{"uniformat":"D3040"},"names":["Energy or heat recovery ventilator"],"aliases":["ERV","HRV","heat recovery ventilator"],"service_life":{"median_years":20,"range_years":[20,20],"range_basis":"source_spread"},"pm_tasks":[],"basis":[{"type":"public_document","life_type":"planning","title":"CNA e-Tool Estimated Useful Life Table","by":"U.S. Department of Housing and Urban Development","url":"https://www.hud.gov/sites/documents/eul_for_cna_e_tool.pdf","page":13,"code":"HUD CNA 3.4.3.1.12","label":"Air filtration/humidity control devices (humidifiers, HRV's)","years":20,"note":"Same life for family and elderly properties. US multifamily housing. HUD's row names HRVs among air filtration and humidity control devices."},{"type":"public_document","life_type":"design","title":"Design standards: employer's requirements – Technical Manual (ER-DFE-XX-XX-T-X-0201, revision A-C01)","by":"Department for Education (England)","url":"https://assets.publishing.service.gov.uk/media/6971f649d8adeaf266040501/ER-DFE-XX-XX-T-X-0201-Technical_Manual-A-C01.pdf","page":256,"code":"5.6.4","label":"Air handling units (AHUs), room-based ventilation units, extract fans and controls: 20 years","years":20,"note":"Printed page 256. AHUs, room-based (heat recovery) ventilation units and extract fans; supply/return fans in AHUs included. Minimum life expectancy (design requirement) for DfE-funded school buildings. Minimum design requirements placed on contractors for school buildings, not observed replacement ages. Section 5.1.4 (sanitaryware) refers to CIBSE Guide M Appendix 12.A1 'in general'."},{"type":"public_document","life_type":"planning","title":"Future Buildings Standard: final stage impact assessment (RPC-MHCLG-25104-IA), 24 March 2026","by":"Ministry of Housing, Communities and Local Government (UK)","url":"https://assets.publishing.service.gov.uk/media/69c16a6113101e9908704acb/Future_Buildings_Standard_Impact_Assessment.pdf","page":77,"code":"Appendix B","label":"\"20 years for light fittings and ventilation equipment\"","years":20,"note":"Printed page 77. One value for two groups. Light fittings in new buildings are LED (the IA applies LED cost learning). 'Ventilation equipment' is generic; mapped to the ventilation component types it clearly includes. Assumption for new non-domestic buildings in England; the IA says the lifetimes are in line with BS EN 15459 (Annex/Appendix E), but they are stated as the department's own modelling assumptions, not a reproduced table. Round-number economic-appraisal assumptions, not observed lives. Same values as the January 2021 Future Buildings Standard consultation IA (separate file), so the two are not independent."}],"confidence":{"grade":"B","sample_size":null},"open_questions":["Every source here is a published planning, design or accounting life. None is observed replacement data.","No preventive maintenance tasks are sourced yet."],"contributors":["unfinished.one editors"],"last_reviewed":"2026-10-22","canonical_url":"https://unfinished.one/c/energy-recovery-ventilator","versioned_url":"https://unfinished.one/c/energy-recovery-ventilator/v/0.2.0","licence":"CC-BY-4.0","citation":"unfinished.one (2026). Energy or heat recovery ventilator, v0.2.0. https://unfinished.one/c/energy-recovery-ventilator/v/0.2.0"}